1/* 2 * "$Id: network.c 3752 2012-03-28 21:58:13Z msweet $" 3 * 4 * Common backend network APIs for CUPS. 5 * 6 * Copyright 2007-2011 by Apple Inc. 7 * Copyright 2006-2007 by Easy Software Products, all rights reserved. 8 * 9 * These coded instructions, statements, and computer programs are the 10 * property of Apple Inc. and are protected by Federal copyright 11 * law. Distribution and use rights are outlined in the file "LICENSE.txt" 12 * "LICENSE" which should have been included with this file. If this 13 * file is missing or damaged, see the license at "http://www.cups.org/". 14 * 15 * This file is subject to the Apple OS-Developed Software exception. 16 * 17 * Contents: 18 * 19 * backendCheckSideChannel() - Check the side-channel for pending requests. 20 * backendNetworkSideCB() - Handle common network side-channel commands. 21 */ 22 23/* 24 * Include necessary headers. 25 */ 26 27#include "backend-private.h" 28#include <limits.h> 29#ifdef __hpux 30# include <sys/time.h> 31#else 32# include <sys/select.h> 33#endif /* __hpux */ 34 35 36/* 37 * 'backendCheckSideChannel()' - Check the side-channel for pending requests. 38 */ 39 40 41void 42backendCheckSideChannel( 43 int snmp_fd, /* I - SNMP socket */ 44 http_addr_t *addr) /* I - Address of device */ 45{ 46 fd_set input; /* Select input set */ 47 struct timeval timeout; /* Select timeout */ 48 49 50 FD_ZERO(&input); 51 FD_SET(CUPS_SC_FD, &input); 52 53 timeout.tv_sec = timeout.tv_usec = 0; 54 55 if (select(CUPS_SC_FD + 1, &input, NULL, NULL, &timeout) > 0) 56 backendNetworkSideCB(-1, -1, snmp_fd, addr, 0); 57} 58 59 60/* 61 * 'backendNetworkSideCB()' - Handle common network side-channel commands. 62 */ 63 64int /* O - -1 on error, 0 on success */ 65backendNetworkSideCB( 66 int print_fd, /* I - Print file or -1 */ 67 int device_fd, /* I - Device file or -1 */ 68 int snmp_fd, /* I - SNMP socket */ 69 http_addr_t *addr, /* I - Address of device */ 70 int use_bc) /* I - Use back-channel data? */ 71{ 72 cups_sc_command_t command; /* Request command */ 73 cups_sc_status_t status; /* Request/response status */ 74 char data[65536]; /* Request/response data */ 75 int datalen; /* Request/response data size */ 76 const char *device_id; /* 1284DEVICEID env var */ 77 78 79 datalen = sizeof(data); 80 81 if (cupsSideChannelRead(&command, &status, data, &datalen, 1.0)) 82 return (-1); 83 84 switch (command) 85 { 86 case CUPS_SC_CMD_DRAIN_OUTPUT : 87 /* 88 * Our sockets disable the Nagle algorithm and data is sent immediately. 89 */ 90 91 if (device_fd < 0) 92 status = CUPS_SC_STATUS_NOT_IMPLEMENTED; 93 else if (backendDrainOutput(print_fd, device_fd)) 94 status = CUPS_SC_STATUS_IO_ERROR; 95 else 96 status = CUPS_SC_STATUS_OK; 97 98 datalen = 0; 99 break; 100 101 case CUPS_SC_CMD_GET_BIDI : 102 status = CUPS_SC_STATUS_OK; 103 data[0] = use_bc; 104 datalen = 1; 105 break; 106 107 case CUPS_SC_CMD_SNMP_GET : 108 case CUPS_SC_CMD_SNMP_GET_NEXT : 109 fprintf(stderr, "DEBUG: CUPS_SC_CMD_SNMP_%s: %d (%s)\n", 110 command == CUPS_SC_CMD_SNMP_GET ? "GET" : "GET_NEXT", datalen, 111 data); 112 113 if (datalen < 2) 114 { 115 status = CUPS_SC_STATUS_BAD_MESSAGE; 116 datalen = 0; 117 break; 118 } 119 120 if (snmp_fd >= 0) 121 { 122 char *dataptr; /* Pointer into data */ 123 cups_snmp_t packet; /* Packet from printer */ 124 const char *snmp_value; /* CUPS_SNMP_VALUE env var */ 125 126 if ((snmp_value = getenv("CUPS_SNMP_VALUE")) != NULL) 127 { 128 const char *snmp_count; /* CUPS_SNMP_COUNT env var */ 129 int count; /* Repetition count */ 130 131 if ((snmp_count = getenv("CUPS_SNMP_COUNT")) != NULL) 132 { 133 if ((count = atoi(snmp_count)) <= 0) 134 count = 1; 135 } 136 else 137 count = 1; 138 139 for (dataptr = data + strlen(data) + 1; 140 count > 0 && dataptr < (data + sizeof(data) - 1); 141 count --, dataptr += strlen(dataptr)) 142 strlcpy(dataptr, snmp_value, sizeof(data) - (dataptr - data)); 143 144 fprintf(stderr, "DEBUG: Returning %s %s\n", data, 145 data + strlen(data) + 1); 146 147 status = CUPS_SC_STATUS_OK; 148 datalen = dataptr - data; 149 break; 150 } 151 152 if (!_cupsSNMPStringToOID(data, packet.object_name, CUPS_SNMP_MAX_OID)) 153 { 154 status = CUPS_SC_STATUS_BAD_MESSAGE; 155 datalen = 0; 156 break; 157 } 158 159 status = CUPS_SC_STATUS_IO_ERROR; 160 datalen = 0; 161 162 if (_cupsSNMPWrite(snmp_fd, addr, CUPS_SNMP_VERSION_1, 163 _cupsSNMPDefaultCommunity(), 164 command == CUPS_SC_CMD_SNMP_GET ? 165 CUPS_ASN1_GET_REQUEST : 166 CUPS_ASN1_GET_NEXT_REQUEST, 1, 167 packet.object_name)) 168 { 169 if (_cupsSNMPRead(snmp_fd, &packet, 1.0)) 170 { 171 int i; /* Looping var */ 172 173 174 if (!_cupsSNMPOIDToString(packet.object_name, data, sizeof(data))) 175 { 176 fputs("DEBUG: Bad OID returned!\n", stderr); 177 break; 178 } 179 180 datalen = (int)strlen(data) + 1; 181 dataptr = data + datalen; 182 183 switch (packet.object_type) 184 { 185 case CUPS_ASN1_BOOLEAN : 186 snprintf(dataptr, sizeof(data) - (dataptr - data), "%d", 187 packet.object_value.boolean); 188 datalen += (int)strlen(dataptr); 189 break; 190 191 case CUPS_ASN1_INTEGER : 192 snprintf(dataptr, sizeof(data) - (dataptr - data), "%d", 193 packet.object_value.integer); 194 datalen += (int)strlen(dataptr); 195 break; 196 197 case CUPS_ASN1_BIT_STRING : 198 case CUPS_ASN1_OCTET_STRING : 199 if (packet.object_value.string.num_bytes < 0) 200 i = 0; 201 else if (packet.object_value.string.num_bytes < 202 (sizeof(data) - (dataptr - data))) 203 i = packet.object_value.string.num_bytes; 204 else 205 i = (int)(sizeof(data) - (dataptr - data)); 206 207 memcpy(dataptr, packet.object_value.string.bytes, i); 208 209 datalen += i; 210 break; 211 212 case CUPS_ASN1_OID : 213 _cupsSNMPOIDToString(packet.object_value.oid, dataptr, 214 sizeof(data) - (dataptr - data)); 215 datalen += (int)strlen(dataptr); 216 break; 217 218 case CUPS_ASN1_HEX_STRING : 219 for (i = 0; 220 i < packet.object_value.string.num_bytes && 221 dataptr < (data + sizeof(data) - 3); 222 i ++, dataptr += 2) 223 sprintf(dataptr, "%02X", 224 packet.object_value.string.bytes[i]); 225 datalen += (int)strlen(dataptr); 226 break; 227 228 case CUPS_ASN1_COUNTER : 229 snprintf(dataptr, sizeof(data) - (dataptr - data), "%d", 230 packet.object_value.counter); 231 datalen += (int)strlen(dataptr); 232 break; 233 234 case CUPS_ASN1_GAUGE : 235 snprintf(dataptr, sizeof(data) - (dataptr - data), "%u", 236 packet.object_value.gauge); 237 datalen += (int)strlen(dataptr); 238 break; 239 240 case CUPS_ASN1_TIMETICKS : 241 snprintf(dataptr, sizeof(data) - (dataptr - data), "%u", 242 packet.object_value.timeticks); 243 datalen += (int)strlen(dataptr); 244 break; 245 246 default : 247 fprintf(stderr, "DEBUG: Unknown OID value type %02X!\n", 248 packet.object_type); 249 250 case CUPS_ASN1_NULL_VALUE : 251 dataptr[0] = '\0'; 252 break; 253 } 254 255 fprintf(stderr, "DEBUG: Returning %s %s\n", data, data + datalen); 256 257 status = CUPS_SC_STATUS_OK; 258 } 259 else 260 fputs("DEBUG: SNMP read error...\n", stderr); 261 } 262 else 263 fputs("DEBUG: SNMP write error...\n", stderr); 264 break; 265 } 266 267 status = CUPS_SC_STATUS_NOT_IMPLEMENTED; 268 datalen = 0; 269 break; 270 271 case CUPS_SC_CMD_GET_DEVICE_ID : 272 if (snmp_fd >= 0) 273 { 274 cups_snmp_t packet; /* Packet from printer */ 275 static const int ppmPrinterIEEE1284DeviceId[] = 276 { CUPS_OID_ppmPrinterIEEE1284DeviceId,1,-1 }; 277 278 279 status = CUPS_SC_STATUS_IO_ERROR; 280 datalen = 0; 281 282 if (_cupsSNMPWrite(snmp_fd, addr, CUPS_SNMP_VERSION_1, 283 _cupsSNMPDefaultCommunity(), 284 CUPS_ASN1_GET_REQUEST, 1, 285 ppmPrinterIEEE1284DeviceId)) 286 { 287 if (_cupsSNMPRead(snmp_fd, &packet, 1.0) && 288 packet.object_type == CUPS_ASN1_OCTET_STRING) 289 { 290 strlcpy(data, (char *)packet.object_value.string.bytes, 291 sizeof(data)); 292 datalen = (int)strlen(data); 293 status = CUPS_SC_STATUS_OK; 294 } 295 } 296 297 break; 298 } 299 300 if ((device_id = getenv("1284DEVICEID")) != NULL) 301 { 302 strlcpy(data, device_id, sizeof(data)); 303 datalen = (int)strlen(data); 304 status = CUPS_SC_STATUS_OK; 305 break; 306 } 307 308 case CUPS_SC_CMD_GET_CONNECTED : 309 status = CUPS_SC_STATUS_OK; 310 data[0] = device_fd != -1; 311 datalen = 1; 312 break; 313 314 default : 315 status = CUPS_SC_STATUS_NOT_IMPLEMENTED; 316 datalen = 0; 317 break; 318 } 319 320 return (cupsSideChannelWrite(command, status, data, datalen, 1.0)); 321} 322 323 324/* 325 * End of "$Id: network.c 3752 2012-03-28 21:58:13Z msweet $". 326 */ 327